#include<stdio.h>
/*
* I_2.c
*
*  Created on: May, 14, 2009
*      Author: yimingliu@fudan.edu.cn
*/

void funI_2_1()
{
	int x,y;
	scanf("%d",&x);
	if(x>=0)
		y=x;
	else if(x<0)
		y=-x;
	printf("%d",y);
}

void funI_2_2()
{
	int x;
	printf("Please enter a int number: ");
	scanf("%d",&x);
	if(x%7==0&&x%3==0)
		printf("Yes.\n");
	else
		printf("No.\n");
}